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You must receive the exam confirmation email at your registered email address.
The subject of the email says "Your Red Hat Individual Exam Reservation Has Been Confirmed"
However, Sharing the remote exam preparation e-book link which has steps to follow and the ISO to download.
You could also go through the following video link which helps you set up the Remote Exam Environment in a stepwise manner. https://www.youtube.com/watch?v=LX3VMIAuPzg
Hope it helps!
This may be compatibility issue related to your computer security settings in BIOS, namely Secure Boot. In some systems "Secure Boot" is enabled by default, you can try another version of ISO (old ISO) or find another system in which secure boot is disabled.
If you read the pdf manual, page 3, the first system requirement:
"Computer: You will need a computer with a single active monitor. Red Hat supports many Intel-compatible X86_64-bit architecture computers"
Apple M1 CPU has ARM architecture, not x86 as required. So it is obvious it not matching the requirements so it cannot work.